Rust获取当前操作系统类型

#[cfg(target_os = "macos")]
static DEFAULT_PATH: &str = "macos";
#[cfg(target_os = "linux")]
static DEFAULT_PATH: &str = "linux";
#[cfg(target_os = "windows")]
static DEFAULT_PATH: &str = "windows";

还可以使用cfg!语法扩展名

if cfg!(target_os = "windows") {
    println!("this is windows");
} else if cfg!(target_os = "macos") {
    println!("this is macos");
} else if cfg!(target_os = "linux") {
    println!("this is linux");
}